A SIP Response Code for Unwanted Calls, July 2017
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This document defines the 607 (Unwanted) SIP response code, allowing called parties to indicate that the call or message was unwanted. SIP entities may use this information to adjust how future calls from this calling party are handled for the called party or more broadly.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.